#pragma once
#define _CRT_SECURE_NO_WARNINGS 1
#include <iostream>
#include <assert.h>
using namespace std;

namespace bit
{
	class string
	{
	public:
		//string();

		string(const char* str = "");

		~string();

		using iterator = char*;
		using const_iterator =const char*;

		void reserve(size_t n);
		void push_back(char ch);
		void append(const char* str);
		string& operator+= (char ch);
		string& operator+= (const char* str);

		void insert(size_t pos, char ch);
		void insert(size_t pos, const char* str);
		void erase(size_t pos, size_t len = npos);

		size_t find(char ch, size_t pos= 0);
		size_t find(const char* str, size_t pos= 0);

		char& operator[](size_t i) const
		{
			assert(i < _size);
			return _str[i];
		}

		char& operator[](size_t i)
		{
			assert(i < _size);
			return _str[i];
		}

		const size_t size() const
		{
			return _size;
		}

		const char* c_str() const
		{
			return _str;
		}

		iterator begin()
		{
			return _str;
		}
		iterator end()
		{
			return _str + _size;
		}

		const_iterator begin()const
		{
			return _str;
		}
		const_iterator end()const
		{
			return _str + _size;
		}
	private:
		char* _str;
		size_t _size;
		size_t _capacity;

	public:
		static const size_t npos;
	};
}
